CHAPTER 12MAINTENANCE AND MATERIAL MANAGEMENTSYSTEMSThe Standard Navy Maintenance and MaterialManagement Systems (3-M) was developed to meet theneed for a more effective means of recording, reporting,and evaluating the maintenance requirements of thefleet. In the past, most maintenance work was recordedonly in the shipboard logs. Although some reports wererequired for failures of specified electronic equipmentsystems and components, material commands had noway of knowing if maintenance was being performedon equipment under their cognizance. There was alsoa lack of financial information. There was no effectiveway of determining what part of the ships operatingtarget (OPTAR) was being spent for repair parts andhow much for consumable material.These needs were partially met by using differentfund codes for the different classifications of material.For example, Equipage, Repair parts, andConsumables. Commands were then able to evaluateOPTAR usage.It was not until the advent of theMaintenance Data System (MDS) that cognizantcommands could determine where maintenanceman-hours and materials were being used and therebyevaluate the performance of equipment.While 3-M and MDS are primarily theresponsibility of other departments supply does have adefinite part in making MDS work. This chapterdiscusses the general concept of the shipboard 3-MSystems and your responsibility in the overalleffectiveness of the program.THE 3-M SYSTEMSEach year, newly developed equipments requiringhighly specialized maintenance are installed aboard theNavys ships. The maintenance requirements for anelectric motor or a circulating pump are relatively fewand simple. This is because of simplicity of design, asmall number of moving parts, and the fact that severalperson may be qualified to perform the maintenancework. This is not the case for automatic engineeringcontrols or the computers used for the control or missileguidance systems. To perform properly, these controlsystems must react immediately and accurately tochanging conditions. The 3-M systems endeavor tosubstitute preventive maintenance for correctivemaintenance, thus reducing equipment malfunction anddowntime.Proper evaluation of equipment cannot be basedonly on planned exercises when all possiblepreparations are made ahead of time. The 3-M systemsprovide a means of continuously reporting maintenanceactions, equipment downtime, repair parts used, and themaintenance personnel required to perform the work,(Equipment downtime is the amount of time anequipment is inoperable due to performance ofmaintenance, lack of repair parts to fix it, or repair isbeyond the capability of ships personnel.) The 3-Msystems is not limited to complex systems. It is equallyapplicable to, and effective for all types of shipboardequipment.The ships 3-M systems consist of the followingsystems designed for maintenance managementPMS (Planned Maintenance System)Inactive Equipment Maintenance (IEM)MDS (Maintenance Data System)AMS (Alteration Management System)IMMS (Intermediate Maintenance ActivityMaintenance Management System)The scope of these systems of most importance to theSK3 and SK2 is described in the followingsubparagraphs.PLANNED MAINTENANCE SYSTEMThe Planned Maintenance System (PMS) wasdeveloped after extensive research on various types ofequipment to determine for each equipment allmaintenance actions required. This includes thefrequency of performance, procedures for performingthe maintenance, and the skill level (rate) required toaccomplish the work. Also the tools and materialsneeded to do the job, normal time required, and safetyprecautions to be observed. The system providesplanning and scheduling information to thedepartments heads, division officers, and maintenance12-1